BufferHelper.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.activemq.artemis.utils;

import org.apache.activemq.artemis.api.core.ActiveMQBuffer;
import org.apache.activemq.artemis.api.core.SimpleString;

/**
 * Helper methods to read and write from ActiveMQBuffer.
 */
public class BufferHelper {

   /**
    * Size of a String as if it was a Nullable Simple String
    */
   public static int sizeOfNullableSimpleString(String str) {
      if (str == null) {
         return DataConstants.SIZE_BOOLEAN;
      } else {
         return DataConstants.SIZE_BOOLEAN + sizeOfSimpleString(str);
      }
   }

   /**
    * Size of a String as it if was a Simple String
    */
   public static int sizeOfSimpleString(String str) {
      return DataConstants.SIZE_INT + str.length() * 2;
   }

   public static void writeAsNullableSimpleString(ActiveMQBuffer buffer, String str) {
      buffer.writeNullableSimpleString(SimpleString.toSimpleString(str));
   }

   public static String readNullableSimpleStringAsString(ActiveMQBuffer buffer) {
      SimpleString str = buffer.readNullableSimpleString();
      return str != null ? str.toString() : null;
   }

   public static void writeAsSimpleString(ActiveMQBuffer buffer, String str) {
      buffer.writeSimpleString(new SimpleString(str));
   }

   /**
    * @param buffer
    */
   public static void writeNullableBoolean(ActiveMQBuffer buffer, Boolean value) {
      buffer.writeBoolean(value != null);

      if (value != null) {
         buffer.writeBoolean(value.booleanValue());
      }
   }

   public static int sizeOfNullableBoolean(Boolean value) {
      return DataConstants.SIZE_BOOLEAN + (value != null ? DataConstants.SIZE_BOOLEAN : 0);
   }

   public static Boolean readNullableBoolean(ActiveMQBuffer buffer) {
      boolean isNotNull = buffer.readBoolean();

      if (isNotNull) {
         return buffer.readBoolean();
      } else {
         return null;
      }
   }

   /**
    * @param buffer
    */
   public static void writeNullableLong(ActiveMQBuffer buffer, Long value) {
      buffer.writeBoolean(value != null);

      if (value != null) {
         buffer.writeLong(value.longValue());
      }
   }

   /**
    * @param buffer
    */
   public static void writeNullableDouble(ActiveMQBuffer buffer, Double value) {
      buffer.writeBoolean(value != null);

      if (value != null) {
         buffer.writeDouble(value.doubleValue());
      }
   }

   public static int sizeOfNullableLong(Long value) {
      return DataConstants.SIZE_BOOLEAN + (value != null ? DataConstants.SIZE_LONG : 0);
   }

   public static int sizeOfNullableDouble(Double value) {
      return DataConstants.SIZE_BOOLEAN + (value != null ? DataConstants.SIZE_DOUBLE : 0);
   }

   public static Long readNullableLong(ActiveMQBuffer buffer) {
      boolean isNotNull = buffer.readBoolean();

      if (isNotNull) {
         return buffer.readLong();
      } else {
         return null;
      }
   }

   /**
    * @param buffer
    */
   public static void writeNullableInteger(ActiveMQBuffer buffer, Integer value) {
      buffer.writeBoolean(value != null);

      if (value != null) {
         buffer.writeInt(value.intValue());
      }
   }

   public static int sizeOfNullableInteger(Integer value) {
      return DataConstants.SIZE_BOOLEAN + (value != null ? DataConstants.SIZE_INT : 0);
   }

   public static Integer readNullableInteger(ActiveMQBuffer buffer) {
      boolean isNotNull = buffer.readBoolean();

      if (isNotNull) {
         return buffer.readInt();
      } else {
         return null;
      }
   }

   public static Double readNullableDouble(ActiveMQBuffer buffer) {
      boolean isNotNull = buffer.readBoolean();

      if (isNotNull) {
         return buffer.readDouble();
      } else {
         return null;
      }
   }

}